Picenum, an ancient division of central Italy, bordering on the Adriatic, Umbria, and the territories of the Sabines and Vestini. It was traversed by spurs of the Apennines, and drained by the Truentus (Tronto) and other streams. Among the towns were Ancona, colonized by Greeks from Syracuse, Firmum (Fermo), Hadria (Atri), Auximum (Osimo), As-culum (Ascoli), and Interamna (Tersamo). The original Umbrian inhabitants were conquered by the Picentes or Piceni, a Sabine people, who were subdued by the Romans in 268 B. O. The Picentes joined in the social war and secured the right of franchise.
Pickaway, a S. central county of Ohio, intersected by the Scioto river, and drained by Darby, Deer, and Walnut creeks; area, about 500 sq. m.; pop. in 1870, 24,875. It has a level surface and a very fertile soil. It is intersected by the Ohio canal, and by the Cincinnati and Muskingum Valley railroad. The chief productions in 1870 were 445,346 bushels of wheat, 2,867,598 of Indian corn,' 95,008 of oats, 72,654 of potatoes, 301,290 lbs. of butter, 80,392 of wool, and 11,399 tons of hay. There were 10,285 horses, 6,491 milch cows, 16,687 other cattle, 24,628 sheep, and 54,288 swine; 4 manufactories of carriages and wagons, 1 of engines and boilers, 7 saw mills, 7 flour mills, 1 distillery, 1 tannery, and 1 currying establishment. Capital, Circleville.
Picton, a town, port of entry, and the capital of Prince Edward co., Ontario, Canada, situated on the bay of Quinte, 115 m. E. by N. of Toronto; pop. in 1871, 2,361. It contains manufactories of iron castings, steam engines, machinery, etc, a brewery, a pottery, a tannery, saw and grist mills, a branch bank, about 60 stores, three weekly newspapers, and churches of five denominations. The value of imports for the year ending June 30,1874, was $26,840; of exports, $178,400.
Piedimonte D'Alife, a town of S. Italy, in the province and 20 m. N. by E. of the city of Caserta, at the foot of Monte Matese; pop. about 8,000. It is remarkable for its mountain scenery, has many cotton mills, and produces excellent oil and wine. The Laurenzana palace is the most remarkable building. The town is said to be built from the ruins of the neighboring ancient Samnian city of Allifaa, at present the site of the small town of Alife.
Pierre Adolphe Daguin, a French physicist, born at Poitiers in 1814. He is a professor in the faculty of sciences, director of the observatory, and member of the academy of sciences of Toulouse. His principal work is Traite elementaire de physique theorique et experi-mentale, avec les applications a la meteorologie et aux arts industriels (3 vols., 1856-'9; 3d revised ed., 4 vols., 1867).
Pierre Adolphe Piorby, a French physician, born in Poitiers, Dec. 31, 1794. He took his degree in 1816, after serving as surgeon in the French army in Spain, became a physician to hospitals in Paris in 1827, and clinical professor at the faculty in 1840, at the Charite in 1846, and at the Hdtel-Dieu in 1864; and in 1866 he retired with a pension. His Traite sur la percussion mediate won the Montyon prize in 1828. This work explains his invention of a new mode of percussion with a plate of ivory or metal, from which he anticipated great improvements in medical practice; but his theories found numerous and influential opponents. His other principal works are: De Vheredite dans les maladies (1840); Traite de medecine pratique et depathologie iatrique ou medicale (9 vols., 1841-'51); Memoire sur la curabilite et le traitement de lapthisiepulmonaire (1860); La medecine du bon sens (1864; 2d ed., 1867); and Traite de plessimetrisme et d'organogra-phisme (1866).